To clarify this. Your application is made up from several processes and you want to implement locking between those or do you want to lock against completely unrelated processes?
Unrelated processes. Safety of some recovery operations depends on some specific files to not be modified (or deleted) in the mean time. Thus I wanted to lock them.
For the first case you can use boost.interprocess for the second case i don't see a portable solution as for example POSIX systems are implementing advisory locking (as opposed to mandatory locking on Windows). On such system you can only have locking between cooperating processes which are obeying to a locking protocol.
This answers my question ("immanuel litzroth" answered it as well but more briefly). Thanks. Adam Badura